\begin{lstlisting}
sage: E := RSACryptosystem(128)
sage: m = E.encoding('The dog ate my lunch.'); m
0101010001101000011001010010000001100100011011110110011100100\
0000110000101110100011001010010000001101101011110010010000001\
1011000111010101101110011000110110100000101110
sage: E.decoding(m)
'The dog ate my lunch.'
\end{lstlisting}%link
